Refrigerating apparatus



July 1, 1930. c. WARNER l763647 yREFRIGERATING APPARATUS Filed March e, 1926 5 '32 i' 2/ l o 50 /25 33 /22 2 w67 34K n sa 5 404/42 g5 27 2@ f@ gx /V 3. l J5 J4 L T- a i 55 i v I 5/ 45 o' I i l /70 6/ 62 i /30 i J f' 31a/ventola 55% Maw /MM MM Patented July l, 193@ CLARENCE 'WARNER|, OF DAYTON, OHIO,

PATENT OFFECE ASSIGNOR, BY MESNE ASSIGNMENTS, TO

FRIGIDAIRE CORPORATION, A CORPORATION OF DELAWARE REFRIQGERATING APPARATUS Application tiled March 6, 1926. Serial No. 92,794.

This invention relates to improvements in sealing devices and particularly to the type of sealing devices used in connection with rotating shafts included in compressors or like devices where it is desirable to have a tight joint between its rotating shaft and the case, or support, in which it operates.

In the particular form in which the invention is herein illustrated a single cylinder compressor is shown, such' as is used in connection with small refrigerator units for compressing the refrigerant. The compresser includes a crankcase and a crankshaft or driving shaft journaled in bearing bosses pro vided in the walls of said crankcase, one end of said crankshaft extending through a wall of the crankcase and having means secured thereto for driving the compressor. In machines of this type the refrigerant is usually drawn into the crankcase of the compressor and then by-passed to the cylinders and there compressed. It' is-important, therefore, that the crankcase shall be both uid and gas tight.

One of the objects of the present invention is to produce a structure that will obtain such tightness of the crankcase and maintain it through along period of operation of the l' compressor.

' Further objects and advantages of the resentinventiony will be apparentl from the v ollowing description, reference being had to the accompanying drawing, wherein a preferred form of the present invention is clearly p tions, however, being shown in elevation for the sake of clearness, the numeral 20 designates the cylinder of theicompresson having a flange 21. The flange conforms with and is adapted to t on the open end of the crankcase 22, a gasket 23 being provided therebe-v tween to prevent leakage at this point.- Studs 2 4 hold the cylinder 20-in position on the crankcase which contains the refrigerant and a proper amount of lubricant. v v

Extending inwardly from opposite side walls of the crankcase are two aligned, bearing bosses 25 and 26 in which the drive shaft 27 is journaled. Grooves 2 8 and 29 formed in bosses 25 and 26 respectively, serve to keep4 the drive shaft journals lubricated. Between connecting rod and its eccentric collar to the shaft 27. In the assembling operation the piston is first placed in` the cylinder. The cylinder is then placed in position on the crankcase, the eccentric collar being aligned with the bearing boss 25 so that the key Way 35 in.the eccentric collar, is in direct align-v ment with the key way 34 in the bearing bosses. The drive shaft 27 includin the key 31 is then inserted in the passage o boss 25 the key 31 passing through the keyway 34 and entering the keyway in ,the eccentric col/ lar. Extending outwardly from the side wallsrof the crankcase are annular extensions formed coaxial with the bearing bosses, said annular extensions forming housing portions on the outside ofthe crankcase. The annularv extension 40 formed on the right side of the c rankcase, as shown in the drawing, has its recessed portion provided with screw threads 41 into which the nut 42 is adapted to be screwed. This nut 42 is hollowed out to re` ceive a coil spring 44, one end of which abuts against the inner wall ofl'said nut. Interposed between the other end of spring 44 and the end of drive shaft 27, which end extends slightly'into the annular extension 40, are two washers 45, the engaging'faces vof said washers being spherical in shape so as to reduce thearea of the contacting surfaces therebetween and thus substantially reduce friction. In the operation of the compressor the washer engaging with the driveshaft 27E will be l carried along'by friction and will rotate therewith while the washer engaging with the spring will be held substantially` stationary.

The annular extension 49 on the left sideof the crankcase, as shown in the drawing, has a fiange 50, which is provided with apertures for receiving studs 5l. The flange 5() of the annular extension hasa slight protuberance 52 which is ground for the purpose of providing a smooth surface for the packing gasket 53.

The drive shaft 27 is provided with a circumferential flange 54, which, when the shaft is in proper assembled position lies inside the annular extension 49 adjacent the inner walls thereof. A bearing ring 55 of any suitable bearing metal preferably of the self-lubricating type comprising a porous metal adapted to be impregnated with a lubricant surrounds the shaft 27 and engages with the outer surface of flange 5,4 in sealing relation therewith, the bearing ring being supported by the peripheral flange 57 of a retaining member or ring 56 carried by a diaphragm as hereinafter described.

A diaphragm 58,.7 provided with a central opening, ts over shaft 27, the inner edge of said diaphragm being spun over the inner edge of retaining or sealing ring 56. This inner edge of the diaphragm is secured to the retaining or sealing ring in any suitable manner such as by welding or soldering. The

Aouter edge of the diaphragm lies adjacent the packing gasket 53.

A clamping gland 60 is provided having apertures for receiving the studs 51. When the studs 51 are drawn up the clamping gland is pulled toward the flange 50 of the annular extension 49, thus tendin to clamp the packing gasket 53 and the e ge'of the dia hragm 58 tightly between the ound sur ace of the protuberance 52 an said clamping gland 60. This provides a tight joint which will tend V.tof revent the leakage of fluid or gas at this point of connection.

The clamping gland 60 has a central aperture 61 through which the shaft 27' extends. The inner surface of this aperture is 4spherical as illustrated at 62, forming a seat for the spherical surface of supporting ring 63 which also surrounds shaft 27 and is interposed between the diaphragm 58 and the clamping gland 60. The spherical surfaces at 62 on both the clamping gland 60 and the supporting ring 63 rovide means Whereby, when one of the stu s 51 is drawn tighter than the other and the clampin gland 60 is n ot'in absolute alignment wit the diaphragm 58, the ring 63 may move relative to said clamping gland 60 to remain parallel -to the ring 55 and thus exert an even pressure on the entire sealing surface.

The end of the shaft 27 that extends beyond the clamping gland 60 has a driving which is soldered or welded to the sealingl ring.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claim which follows.

What is claimed is as follows:

In combination a casing having an opening in its wall, a rotary shaft extending through the opening and means for sealing the shaft gas tight to the casing including a shoulder on the shaft, a sealing ring frictionally engaging the shoulder, means for urging the shoulder against the ring, a flexible diaphragm supporting the ring, means for clamping the diaphragm gas tight to the casing, said means including an abutment adapted to receive the thrust of the urging means, a rigid thrust member for transmitting the thrust of the urging means to the abutment, and means for maintaining the thrust member parallel to the ring.

In testimony whereof I hereto aiiix my signature.

CLARENCE WARNER'. 

